public function testHandlerForEventBookAdded()
{
$id = Uuid::createNew();
$title = 'foo';
$isbn = 'bar';
$event = new BookAdded($id, [], $title, $isbn);
$storage = $this->getMockBuilder(Storage::class)->disableOriginalConstructor()->getMock();
$storage->expects(self::once())->method('upsert')->with($id, self::anything());
$service = new BookService($storage);
$service->onBookAdded($event);
}
